As mobile networkarchitectures evolve from 3G to 4G LTE and beyond, to offer higher capacity amidst constraints of bandwidth, spectrum and interference management, innovative synchronization solutions are needed for both indoor and outdoor coverage.
Synchronization requirements are getting more stringent in the next generation 4G LTE-TDD and LTE-A infrastructure. Qulsar’s Managed Timing Engine (MTE) Module M68 series, is a full packet network based synchronization engine, designed for applications that require distribution of frequency and phase synchronization from edge nodes such as a Carrier Ethernet demarcation point, or macro base station that is aggregating traffic from small cells or substation clocks in power utility smart grids. the M68 series can also be used to build Time Servers or Edgemaster clocks to synchronize a small cell cluster.
A key innovation is that the M68 is much more than a boundary clock. It is a Gateway Clock that can take 1PPS and Time of the Day (ToD) from a GNSS receiver, as well as IEEE1588 PTP or SyncE input from the network, and deliver PTP, Time of the Day and Frequency as output.
The key differences between a boundary clock and a gateway clock is that in a boundary clock the master side gets its reference from the slave side; whereas in a gateway clock, the master side uses an external (primary) time reference such as 1PPS and ToD (from a GNSS receiver) and is thus essentially a Grand Master. In addition to GNSS, a gateway clock can use PTP or any other frequency source that is capable of being a reference. Examples include SyncE or macro sniff, also known as Network Listen (NL).
The M68 is a boundary clock module that provides a simple and cost effective option to integrate precision timing by replacing standard generic parts in host systems such as femtocells, small cells and carrier Ethernet equipment. The M68 can replace the PHY in the host system, supporting line-rate traffic.
For rapid ‘turnkey’ integration, the M68 should be prepackaged in a subsystem (such as a P68 board or a Local Gateway Master such as the QLGM) that can be fairly quickly used as a synchronization "system", enabling a rapid design cycle while allowing for deeper integration at a later time. The first step towards integration is the purchase of an Evaluation & Developer’s Kit that includes all the interface details, licenses and tools necessary for enabling the design effort.
The M68 series module has industry leading algorithms. These enable it to extract precise time signals from packets impeded over the network by traffic load, congestion and packet delay variation (PDV).
In addition, the M68 series has cutting edge patented technology that enables it to manage multiple clock domains from multiple inputs. The ability to use multiple synchronization inputs is particularly powerful in today’s applications, where a host system may need to be versatile and deployable in multiple environments.
1 ITU-T G.8261 tests conducted at both Qulsar internal labs and 3rd party labs – details available on request and under NDA
2 With industry standard PDV profiles of switches and network conditions.
Qulsar may make changes to specifications and product descriptions at any time, without notice.